He went on to study wildlife conservation before joining Extinction Rebellion.

Mr Coleman was arrested at a protest outside the Brazillian embassy last August.

He wrote: "My actions aren’t about sacrifice, or arrest for the sake of it. Knowing the science, I have no choice but to tell the truth, and stick to my morals in the face of that truth. I won’t stand by and watch the world burn.

“I’m rebelling in love for this world and the wild. In compassion for the indigenous, local and First Nations peoples who are persecuted protecting the ecosystems we all need to survive. In rage for the environmental defenders murdered every week – my siblings in the fight for life.”

Eliza Bennett, who also starred in Nanny McPhee, paid tribute to him, writing: "I was so heartbroken to hear about Raphael (now James Iggy).

"After we worked on Nanny McPhee, he dedicated his life to protecting wildlife and fighting climate change."